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A bar magnet P, a time period 2 seconds in an uniform magnetic field. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true

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Q is of non magnetic substance

Q is a bar magnet identical to P and its north pole is placed on the top of P's north pole

Q is an unmagnetised ferromagnetic material

Nothing can be said about Q's property

answer is B.

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Detailed Solution

$T = 2 π \sqrt{\frac{I}{{MB}_{H}}}$

If Q is an identical bar magnet then time period of system will be

$T^{'} = 2 π \sqrt{\frac{2 I}{{(M_{P} + M_{Q}) B}_{H}}}$ , these two will be equal only when the north pole of the magnet P is placed in the north pole of Q.

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